为了研究固体蓄热装置的蓄放热特性,以综合性能较好的MgO固体作为蓄热体,在其中分别开设不同孔数的圆形或椭圆形孔道,将空气作为热能转换与传输介质,分析了蓄热体中放热孔形和孔数对其蓄放热特性的影响,并进行了蓄热体的蓄热时间和放热换热量等参数的数值计算与对比分析.结果表明:采用椭圆形孔道且按长轴与蓄热流方向相同布置时更有利于快速蓄热;随着气流的深入,孔数越多,相同位置下的气流速度、温度的变化越大,初始时的放热量越多,达到相同放热流量的时间越短;孔形对放热的影响不大.研究结果可为蓄热体放热孔形的优化选择及合理布置提供依据,为其实际应用提供参考.%In order to study the heat storage and discharge performance of solid heat storage devices, this paper adopts solid Magnesia (MgO) of good overall performance as the heat storage media. Different numbers of circular and elliptical channels were set up on the heat storage device, and air was used as the heat transfer media during the discharging process. The effects of pore shape and number on the heat storage device's heat discharge characteristics were investigated. Moreover, through simulation, the time of the heat storage media reaching the steady state in heat storage process, and the heat flow at the pipe outlet during the discharging process and other parameters were compared. The results show that, it speeds up the heat storage with elliptical channels while the longer spans are in the same direction as the heat storage flow. While the air flow goes deeper, large channel numbers makes the change of air speed and temperature in the same location larger, the more the heat release at the beginning, the less time releasing the same amount of heat takes. However, pore shape has little effect on the heat release. This study provides solid evidences for making better decisions about adopting channels and setting their locations, and provides references for scientific and reasonable application in heat supply system.
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